US11808040B2 - Insulation board with improved performance - Google Patents

Insulation board with improved performance Download PDF

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Publication number
US11808040B2
US11808040B2 US17/015,295 US202017015295A US11808040B2 US 11808040 B2 US11808040 B2 US 11808040B2 US 202017015295 A US202017015295 A US 202017015295A US 11808040 B2 US11808040 B2 US 11808040B2
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United States
Prior art keywords
woven
facer
facer material
rolls
insulation board
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US17/015,295
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US20200399901A1 (en
Inventor
Matthew Leatherman
Xuan Zhang
Cody Turnow
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Carlisle Construction Materials LLC
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Carlisle Construction Materials LLC
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Priority to US17/015,295 priority Critical patent/US11808040B2/en
Assigned to Carlisle Construction Materials, LLC reassignment Carlisle Construction Materials, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TURNOW, CODY, LEATHERMAN, MATTHEW, ZHANG, XUAN
Assigned to Carlisle Construction Materials, LLC reassignment Carlisle Construction Materials, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TURNOW, CODY, ZHANG, XUAN, LEATHERMAN, MATTHEW
Publication of US20200399901A1 publication Critical patent/US20200399901A1/en
Priority to US17/322,655 priority patent/US11319708B2/en
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    • E—FIXED CONSTRUCTIONS
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    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D1/00—Roof covering by making use of tiles, slates, shingles, or other small roofing elements
    • E04D1/28—Roofing elements comprising two or more layers, e.g. for insulation
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    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2375/00—Polyureas; Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B32B2419/06—Roofs, roof membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape

Definitions

  • the present invention relates to improved insulation board performance imparted by enhanced physical properties through the use of woven mats as facers for insulation boards used in building construction in general and in roofing construction in particular.
  • VSH Very Severe Hail
  • facers for polyurethane or polyisocyanurate (Polyiso) foam roofing insulation boards are typically made either from a Glass Reinforced Felt (GRF) facer or from a Coated Glass Facer (CGF) material. Facers serve a few purposes on the insulation board and in the roof system. For example, facers help provide structural integrity to the foam board and protect the friable foam surface from forces exerted by hail, foot traffic, heavy HVAC equipment and construction equipment. Facers also provide added strength to the foam board with regard to wind uplift performance. Both GRF and CGF contain fiberglass and thus are skin irritants during the manufacturing process and in end-use application.
  • glass fibers are added to the paper to improve dimensional stability, especially when the facer is wet.
  • the glass fibers do not prevent the board from warping due to dimensional change in the GRF facer after exposure to moisture, or from losing strength while exposed to moisture, such as a leak.
  • coated glass facers do offer improved resistance to moisture and mold when compared to GRF facers, these facers discolor after exposure to moisture, and are rigid so they do not spread force across the board, and also have the tendency to absorb excessive amounts of chemicals during the production of the foam board.
  • the fasteners that secure these foam roofing boards to the roof also pass through the boards' facers.
  • wind uplift across the boards can cause fastener pull-through which results in failure of the fully adhered roof system.
  • additional fasteners are typically driven through the insulation board to keep the board anchored to the roof deck.
  • a polyurethane or polyisocyanurate foam roofing insulation board facer material that would both provide load spreading and added surface strength. Specifically, it would be desirable to provide a facer that assists in spreading surface loads such that the potential for fastener pull-through during wind uplift can be reduced or eliminated.
  • the advantage of load spreading to prevent fastener pull-through also helps to firmly secure the foam insulation board to the roof.
  • Another advantage of such added surface strength is that it would offer increased indentation resistance. This indentation resistance would be advantageous against hail hitting the roof.
  • the ideal roofing system would be able to pass the recently announced “Very Severe Hail” test rating announced by Factory Mutual as described in FM 4470 (Class 1—VSH).
  • a facer having the desired indentation resistance would also be advantageous against workers kneeling on the roof or foot traffic on the roof during installation or roof repair.
  • the present system provides this strength and load-spreading advantages.
  • the present system has been shown to meet the Very Severe Hail (VSH) test rating.
  • the present facer even preferably permits the roofing system to meet the Very Severe Hail (VSH) test rating even when a low or typical density insulation board is used (For example, such a density range can even be as low as found in typical density insulation boards, and could even be in the range of 0.5 to 6.0 pcf).
  • load spreading will allow higher wind uplift values to be achieved with equivalent fasteners
  • load spreading will also allow an equivalent uplift to be achieved utilizing fewer fasteners. Reducing the number of fasteners in a roof system while maintaining wind uplift performance is highly advantageous because it requires less labor to install a roof system with fewer fasteners, fewer fasteners reduces the material cost of the roof system, and fewer fasteners results in fewer penetrations of the polyurethane or polyisocyanurate foam board, minimizing heat sinks, thereby leading to improved insulating performance of the insulation board.
  • the present invention comprises an insulation board assembly, having: a foam insulation board (which may optionally be polyurethane or polyisocyanurate, or a phenolic material or an expanded polystyrene material (EPS)); a woven mat as the top facer attached onto a top side of the foam insulation board; and a woven mat as the bottom facer attached onto a bottom side of the foam insulation board.
  • a foam insulation board which may optionally be polyurethane or polyisocyanurate, or a phenolic material or an expanded polystyrene material (EPS)
  • EPS expanded polystyrene material
  • the woven facers may be made of natural and/or synthetic yarns and/or tapes.
  • Suitable synthetic yarns or tapes can be made from polymers such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, polyester, acrylic polyester, polyamide, aramid etc.
  • Suitable natural yarns can be made from nature fibers, such as cotton, cellulose, wool, rayon, silk, hemp, sisal, etc.
  • the woven mats can have different weave density.
  • Fabric Mesh is a measure of the density of the fabric weave as the number of yarns or tapes per inch in both the Warp (machine) and Weft (cross) directions. Ends per inch (EPI) is the number of warp yarns or tapes per inch of woven fabric and picks per inch (PPI) is the number of weft yarns and tapes per inch of woven fabric.
  • the weave density can be 2 tapes per inch ⁇ 2 tapes per inch (EPI ⁇ PPI) to 100 tapes per inch ⁇ 100 tapes per inch.
  • the weave density would be 4 ⁇ 4 to 60 ⁇ 60 mesh.
  • the weave density would be 4 ⁇ 4 to 30 ⁇ 30 mesh.
  • the woven mats have different weave density along warp and weft direction, for example, the weave density can optionally be 4 ⁇ 8 mesh in one embodiment.
  • the present woven mats can have different weights, typically measured by the fabric weight in ounces per square yard or grams per square meters.
  • the woven mat weight can optionally be from 10 gsm to 400 gsm.
  • the woven mat weight could be from 20 gsm to 200 gsm.
  • the woven mat weight could be from 40 gsm to 100 gsm.
  • the woven mats can have different thicknesses.
  • the woven mat thickness can be from 1 mil to 200 mil.
  • the woven mat thickness could be from 2 mil to 100 mil.
  • the woven mat thickness could be from 2 mil to 50 mil.
  • the woven mat can have a coating on one or both sides of the surface.
  • the coating can be of different polymer compositions, such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, silicones, acrylates, natural rubber, styrene-butadiene rubber, etc.
  • such coating will provide bleed through resistance during the polyurethane or polyisocyanurate board manufacturing process, water resistance during foam board transportation, and slip and water resistance during field installation.
  • the coating may additionally provide improved adhesion to the polyurethane or polyisocyanurate foam during manufacturing and provide improved compatibility and adhesion to bonding adhesives during field installation.
  • the bonding adhesives can consist of different polymer compositions, such as polyurethane, nitrile, neoprene, chloroprene, silane-terminated polyether, styrene butadiene rubber, acrylic, ethylene propylene diene monomer (EPDM), etc.
  • each of the top and bottom woven mats can have an additional layer of non-woven material laminated to one or both sides.
  • the lamination could optionally be done with adhesives or with a tie layer.
  • the non-woven layer may increase the surface roughness and surface area of the woven mat to allow the woven mat to have better adhesion or bonding with the polyurethane or polyisocyanurate foam.
  • the non-woven layer is positioned on the outside (i.e.: top or bottom) of the foam insulation board, it may enhance the slip resistance and improve adhesion performance with bonding adhesives during the field installation.
  • the non-woven fiber can optionally be made of different polymer composition, such as polyester, polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, glass, Kevlar, basalt, carbon fiber, etc.
  • polymer composition such as polyester, polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, glass, Kevlar, basalt, carbon fiber, etc.
  • the woven mats may be laminated with a glass scrim, glass mat, carbon fibers scrim, or coated PET scrim.
  • these materials could potentially improve dimensional stability of the facer and the insulation board.
  • the woven mats can be made of low shrinkage polymer yarns or tapes.
  • the shrinkage rate of polymer tape can be assessed by the percentage of length change when the polymer tape is heated from room temperature to 100° C.
  • the polymer tape used in the woven mat has ⁇ 10% in shrinkage rate.
  • the polymer tape has ⁇ 5% shrinkage rate.
  • flame retardants can be added to polymer yarns or tapes to enhance the fire resistance of the woven facer.
  • the present invention comprises a rolled woven facer material having a sufficiently desirable strength in both its machine direction and its cross direction.
  • This rolled woven material can then be used as a top and/or bottom facer to a polyurethane or polyisocyanurate foam insulation board.
  • this rolled woven facer material is quite thin and has low weight.
  • the present woven polypropylene facer has a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction, and also has a tongue tear strength of over 15 lbf in both a machine direction and a cross direction.
  • the present woven facer material includes the fact that it provides added surface strength, load-spreading and durability as compared to existing GRF and CGF facers. Such added surface strength and load-spreading allows for foot traffic and kneeling on the insulation boards during roof installation. It also provides superior hail resistance and equivalent mold/moisture resistance to that of CGF.
  • the present roofing system comprising the present facer has been shown to meet the “Very Severe Hail” test rating announced by Factory Mutual as described in FM 4470 (Class 1—VSH).
  • the present woven facer is preferably a light but strong and heavy duty material.
  • An advantage of the present woven facer material is that it has higher fastener pull through force, and thus provides excellent wind uplift resistance after the insulation board has been secured to the roof.
  • the present woven facer system is also very durable and lengthens the effective lifespan of the foam roofing insulation board.
  • the woven facers are made of a polymer, such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, polyester, polyamide, etc.
  • other woven materials including both natural and synthetic yarns or tapes, such as cotton, cellulose, rayon, silk, hemp, sisal, etc. can be used as well.
  • the present woven facer system also offers the advantages of a higher flex modulus and a higher fastener-plate pull-through resistance as compared to traditional GRF and CGF facers.
  • the present facer can optionally be made from a plastic film that has been drawn into filaments or tapes, and then woven to create a fabric sheet or mat.
  • the woven mat optionally comprises a nonwoven layer on one side that will promote adhesion to the polyurethane or polyisocyanurate foam and polymer coating on the other side that will enhance water, moisture and bleed through resistance.
  • the polymer coating can optionally provide improved compatibility and adhesion to bonding adhesives during field installation.
  • the present woven facer material is its low cost.
  • the present woven facer materials can optionally be made from recycled plastics, providing environmental benefits.
  • FIG. 1 is a sectional side elevation view of a foam insulation board with top and bottom woven facers.
  • FIG. 2 is a sectional side elevation view of a foam insulation board similar to FIG. 1 , but with a non-woven layer or coating above and below each of the top and bottom woven facers.
  • FIG. 3 is a sectional side elevation view of a foam insulation board similar to FIG. 2 , but with a tie layer securing the woven and non-woven layers together.
  • the present system provides an insulation board assembly 10 that comprises: a foam insulation board 12 that may optionally be made of polyurethane or polyisocyanurate foam, or a phenolic material or an expanded polystyrene material (EPS)); a top woven facer 20 A attached onto a top side of the foam insulation board, top facer 20 A being made of woven material that may optionally include polypropylene; and a woven bottom facer 20 B attached onto a bottom side of the foam insulation board, bottom facer 20 B also optionally being made of woven polypropylene.
  • a foam insulation board 12 that may optionally be made of polyurethane or polyisocyanurate foam, or a phenolic material or an expanded polystyrene material (EPS)
  • EPS expanded polystyrene material
  • top woven facer 20 A attached onto a top side of the foam insulation board, top facer 20 A being made of woven material that may optionally include polypropylene
  • a woven bottom facer 20 B attached
  • the present system provides a thin, rolled woven facer material that has sufficient strength in both its machine and cross directions that can be attached onto the foam insulation board (for example, during an extrusion process with the foam being sandwiched between top and bottom woven facers).
  • polyurethane or polyisocyanurate is a closed-cell, rigid foam insulation board consisting of a foam core sandwiched between two facers. It is the most widely used insulating material for above-deck commercial roof construction in North America. In many existing systems, the facer materials are fiberglass, but even kraft paper has been used.
  • These polyurethane or polyisocyanurate insulation boards are attached to the roof deck with various mechanical fasteners and construction adhesives or held in place with ballast stones or concrete pavers placed above the roofing membrane.
  • the roofing membrane also may be mechanically attached through the foam insulation, adhered to the top polyurethane or polyisocyanurate facer or even held in place with ballast.
  • the Pull-Through test procedure is designed to evaluate the strength of substrate/stress plate combinations by using tensile loading.
  • the test method described below utilizes a nominal 14 ⁇ 14 in. test sample and test jig.
  • the test method is intended to be used to evaluate various membranes, membrane/stress plate combinations, substrates or substrate/stress plate combinations for comparison to each other in order to determine the products are to be used large scale wind resistance classification testing.
  • the detailed testing procedure is as follows.
  • the 14 ⁇ 14 Substrate Test Jig is secured to the moving crosshead of the Tinius Olsen machine.
  • the sample is slid into the 14 ⁇ 14 Substrate Test Jig with the stress plate located on the underside of the test sample.
  • the screw end of the fastener is then secured in into the stationary jaw.
  • Force is exerted in a direct line perpendicular to the plane of the substrate/stress plate interface at a crosshead speed of 2 in./min (51 mm/min). While the sample is being tested, the sample shall be visually examined to ensure that it continues to meet the Conditions of Acceptance.
  • the sample shall be examined and any item not conforming to the Conditions of Acceptance noted.
  • the results of the Pull-Through Test shall be stated in pounds.
  • the result assigned to the sample shall be the maximum force which the sample reached prior to failure.
  • Conditions of Acceptance are: 1. all samples should remain secured in their test jig until failure of the test sample; 2. the overall sample results shall be determined based on the average of three (3) tests. If the standard deviation of the three values divided by the mean is greater than 20%, an additional test(s) shall be conducted. The results of all tests shall be used to determine the final average.
  • woven polypropylene facers 20 A and 20 B offered substantial benefits (as described herein) over traditional GRF and CGF facers.
  • the present woven facers 20 A and 20 B provide the advantages of strength in both (perpendicular) machine direction and cross directions.
  • the strength in the cross direction is at least 70% of the strength in the machine direction.
  • the present facer materials preferably have weight of 20 gsm to 200 gsm; and a tensile strength of at least 80 lb.
  • the advantage of this small thickness is that it makes the facers easier to roll.
  • the woven facers 20 A and 20 B can be made of natural and/or synthetic yarns and/or tapes.
  • the synthetic yarns or tapes can be made from polymers such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, polyester, acrylic polyester, polyamide, aramid etc.
  • the yarns can be made from natural fibers, such as cotton, cellulose, wool, rayon, silk, hemp, sisal, etc.
  • the present insulation board assembly meets the Very Severe Hail (VSH) rating of FM 4470 (Class 1). This can even be accomplished using low or typical density insulation board.
  • the foam insulation board has a density of 0.5 to 6.0 pcf. This represent an advantage over existing (and costlier) approaches of using gypsum or press board to achieve the Very Severe Hail (VSH) rating.
  • the adhesion between the insulation board and the facer could potentially be stronger than can be achieved by existing standard density insulation boards and facers made of paper, glass fiber reinforced paper or coated glass facers (GRF/CGF), foils, films or laminates.
  • GPF/CGF glass fiber reinforced paper or coated glass facers
  • the present insulation board with woven facer may also be used under a sheet of roof membrane, such as EPDM (Ethylene Propylene Diene Monomer), TPO (thermoplastic olefin), PVC (polyvinyl chloride), KEE (ketone ethylene ester) or Hypalon, of various thickness to provide a roofing structure capable of achieving the Very Severe Hail (VSH) rating.
  • EPDM, TPO, PVC, KEE and Hypalon roof membrane can have non-woven materials laminated on the back side. The non-woven fleece could potentially improve the adhesion performance of roof membrane to the insulation board.
  • bonding adhesives are used to adhere the roof membrane onto the insulation board.
  • bonding adhesive can include extruded coatings, spray coatings or roller applied coatings.
  • adhesive promoters include Flexible FASTTM, TPO bonding adhesive, Cav-Grip IIITM and EPDM bonding adhesive.
  • VSH Very Severe Hail
  • the present roof systems using standard density or high density insulation board and woven PP facers can be paired with TPO FleeceBACK, EPDM FleeceBACK, PVC FleeceBACK, KEE FleeceBACK and bareback TPO, EPDM, PVC and KEE HP.
  • These membranes may optionally be bonded with two-part polyurethane adhesive, TPO Bonding adhesives, PVC adhesives, EPDM Bonding Adhesives, water based adhesives, LVOC bonding adhesives and Cav-Grip III.
  • This type of roof system has significant performance advantageous over that with OSB and plywood board as the insulation board with woven PP facer delivers higher R-value per inch and is less costly.
  • VSH test results for normal density Polyiso board with woven PP facer Testing VSH Insulation Source Membrane Adhesive Location Results Standard This 80 mil TPO Cav-Grip III in-house pass Density in- 90 mil White 90-8-30A in-house pass Polyiso vention EPDM w/Woven 105 EPDM Flex FAST in-house pass PP Facer Fleece 60 mil TPO Cav-Grip III FM pass 80 mil TPO Cav-Grip III FM pass
  • system 10 comprises a foam insulation board 12 , having a top woven facer 20 A and a bottom woven facer 20 B, as described above.
  • top woven facer 20 A and bottom woven facer 20 B comprise no glass fibers.
  • Foam insulation board preferably has a density of 0.5 to 6.0 pcf and the fastener Pull-Through value is higher than 300 lbf.
  • the roof assembly 10 consists of roof membrane, bonding adhesive and the insulation board, and wherein the roof assembly meets the Very Severe Hail rating of FM 4470 (Class 1).
  • each of woven facers 20 A and 20 B comprise yarns or tapes made from synthetic polymers such as woven polypropylene and/or propylene alpha-olefin copolymers or ethylene alpha-olefin copolymers having a warp density from 4 to 30 EPI or a weft density from 4 to 30 PPI, a weight from 40 to 200 grams per square meter, and a thickness of 2 mil to 50 mil.
  • each of the top and bottom facers 20 A and 20 B have a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction and a tear strength of over 15 lbf in both a machine direction and a cross direction.
  • each of facers 20 A and 20 B may optionally have a polymer coating on one or both side of one or both of the top and bottom facers (i.e.: 22 A, 24 A, 22 B and 24 B).
  • polymer coating layers 22 A, 24 A, 22 B and 24 B are selected from the group consisting of: polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, silicones, acrylates, polyurethane, natural rubber, and styrene butadiene rubber.
  • each of facers 20 A and 20 B may optionally have a non-woven material laminated on one or both side of one or both of the top and bottom facers (i.e.: layers 22 A, 24 A, 22 B and 24 B).
  • the non-woven material layers may be selected from the group consisting of polyester, polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, glass, Kevlar, basalt, and carbon fiber.
  • layers 22 A, 24 A, 22 B and 24 B can comprise various polymer coatings or other non-woven material.
  • layers 24 A and 24 B can comprise a laminated glass mat, a glass scrim or a coated glass scrim.
  • the non-woven layers 24 A and 24 B can be laminated to the woven layers 20 A and 20 B via an adhesive or a tie layer 26 A, 26 B.
  • the present system comprises a rolled insulation facer formed from a woven material having a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction, and a tear strength of over 15 lbf in both the machine direction and the cross direction.
  • the woven material comprises yarns or tapes made from synthetic polymers, including but not limited to polypropylene and/or propylene alpha-olefin copolymers and/or ethylene alpha-olefin copolymers.
  • the woven material is waterproof

Abstract

An insulation board assembly, having: a foam insulation board; a top facer attached onto a top side of the foam insulation board, the top facer being made of woven material; and a bottom facer attached onto a bottom side of the foam insulation board, the bottom facer being made of woven material. The top and bottom woven facers may have upper and lower coatings and non-woven layers on either side and woven and non-woven layers may be held together with a tie layer.

Description

RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 16/601,203 filed Oct. 14, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/749,530 filed Oct. 23, 2018 and U.S. Provisional Patent Application No. 62/819,089 filed Mar. 15, 2019, the entire disclosures of which are incorporated herein by reference in their entireties for all purposes.
TECHNICAL FIELD
The present invention relates to improved insulation board performance imparted by enhanced physical properties through the use of woven mats as facers for insulation boards used in building construction in general and in roofing construction in particular. When used in a roof assembly, the present invention permits the roofing system to meet the Very Severe Hail (VSH) testing rating with a low or typical density insulation board.
BACKGROUND OF THE INVENTION
Currently, facers for polyurethane or polyisocyanurate (Polyiso) foam roofing insulation boards are typically made either from a Glass Reinforced Felt (GRF) facer or from a Coated Glass Facer (CGF) material. Facers serve a few purposes on the insulation board and in the roof system. For example, facers help provide structural integrity to the foam board and protect the friable foam surface from forces exerted by hail, foot traffic, heavy HVAC equipment and construction equipment. Facers also provide added strength to the foam board with regard to wind uplift performance. Both GRF and CGF contain fiberglass and thus are skin irritants during the manufacturing process and in end-use application. With GRF facers, glass fibers are added to the paper to improve dimensional stability, especially when the facer is wet. However, the glass fibers do not prevent the board from warping due to dimensional change in the GRF facer after exposure to moisture, or from losing strength while exposed to moisture, such as a leak. While coated glass facers do offer improved resistance to moisture and mold when compared to GRF facers, these facers discolor after exposure to moisture, and are rigid so they do not spread force across the board, and also have the tendency to absorb excessive amounts of chemicals during the production of the foam board. Additional disadvantages of these fiberglass containing facer materials include: (a) they do not offer sufficiently strong indentation resistance, (b) they tend to peel off and delaminate from the polyurethane or polyisocyanurate insulation boards, and (c) the glass fiber content results in handling complaints during production and installation of the boards.
Importantly, the fasteners that secure these foam roofing boards to the roof also pass through the boards' facers. Unfortunately, wind uplift across the boards can cause fastener pull-through which results in failure of the fully adhered roof system. To improve wind uplift performance of the roof system, additional fasteners are typically driven through the insulation board to keep the board anchored to the roof deck.
Therefore, what is instead desired is a polyurethane or polyisocyanurate foam roofing insulation board facer material that would both provide load spreading and added surface strength. Specifically, it would be desirable to provide a facer that assists in spreading surface loads such that the potential for fastener pull-through during wind uplift can be reduced or eliminated. The advantage of load spreading to prevent fastener pull-through also helps to firmly secure the foam insulation board to the roof. Another advantage of such added surface strength is that it would offer increased indentation resistance. This indentation resistance would be advantageous against hail hitting the roof. Most preferably, the ideal roofing system would be able to pass the recently announced “Very Severe Hail” test rating announced by Factory Mutual as described in FM 4470 (Class 1—VSH). In addition, a facer having the desired indentation resistance would also be advantageous against workers kneeling on the roof or foot traffic on the roof during installation or roof repair. As will be explained, the present system provides this strength and load-spreading advantages. In fact, the present system has been shown to meet the Very Severe Hail (VSH) test rating. In addition, the present facer even preferably permits the roofing system to meet the Very Severe Hail (VSH) test rating even when a low or typical density insulation board is used (For example, such a density range can even be as low as found in typical density insulation boards, and could even be in the range of 0.5 to 6.0 pcf).
While load spreading will allow higher wind uplift values to be achieved with equivalent fasteners, load spreading will also allow an equivalent uplift to be achieved utilizing fewer fasteners. Reducing the number of fasteners in a roof system while maintaining wind uplift performance is highly advantageous because it requires less labor to install a roof system with fewer fasteners, fewer fasteners reduces the material cost of the roof system, and fewer fasteners results in fewer penetrations of the polyurethane or polyisocyanurate foam board, minimizing heat sinks, thereby leading to improved insulating performance of the insulation board.
SUMMARY OF THE INVENTION
In one aspect, the present invention comprises an insulation board assembly, having: a foam insulation board (which may optionally be polyurethane or polyisocyanurate, or a phenolic material or an expanded polystyrene material (EPS)); a woven mat as the top facer attached onto a top side of the foam insulation board; and a woven mat as the bottom facer attached onto a bottom side of the foam insulation board. Optionally, the woven facers may be made of natural and/or synthetic yarns and/or tapes. Suitable synthetic yarns or tapes can be made from polymers such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, polyester, acrylic polyester, polyamide, aramid etc. Suitable natural yarns can be made from nature fibers, such as cotton, cellulose, wool, rayon, silk, hemp, sisal, etc.
The woven mats can have different weave density. Fabric Mesh is a measure of the density of the fabric weave as the number of yarns or tapes per inch in both the Warp (machine) and Weft (cross) directions. Ends per inch (EPI) is the number of warp yarns or tapes per inch of woven fabric and picks per inch (PPI) is the number of weft yarns and tapes per inch of woven fabric. For example, the weave density can be 2 tapes per inch×2 tapes per inch (EPI×PPI) to 100 tapes per inch×100 tapes per inch. Preferably, the weave density would be 4×4 to 60×60 mesh. Most preferably, the weave density would be 4×4 to 30×30 mesh. Optionally, the woven mats have different weave density along warp and weft direction, for example, the weave density can optionally be 4×8 mesh in one embodiment.
The present woven mats can have different weights, typically measured by the fabric weight in ounces per square yard or grams per square meters. For example, the woven mat weight can optionally be from 10 gsm to 400 gsm. Preferably, the woven mat weight could be from 20 gsm to 200 gsm. Most preferably, the woven mat weight could be from 40 gsm to 100 gsm. Alternatively, the woven mats can have different thicknesses. For example, the woven mat thickness can be from 1 mil to 200 mil. Preferably, the woven mat thickness could be from 2 mil to 100 mil. Most preferably, the woven mat thickness could be from 2 mil to 50 mil.
Optionally, the woven mat can have a coating on one or both sides of the surface. The coating can be of different polymer compositions, such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, silicones, acrylates, natural rubber, styrene-butadiene rubber, etc. Advantageously, such coating will provide bleed through resistance during the polyurethane or polyisocyanurate board manufacturing process, water resistance during foam board transportation, and slip and water resistance during field installation. The coating may additionally provide improved adhesion to the polyurethane or polyisocyanurate foam during manufacturing and provide improved compatibility and adhesion to bonding adhesives during field installation. The bonding adhesives can consist of different polymer compositions, such as polyurethane, nitrile, neoprene, chloroprene, silane-terminated polyether, styrene butadiene rubber, acrylic, ethylene propylene diene monomer (EPDM), etc.
Optionally, each of the top and bottom woven mats can have an additional layer of non-woven material laminated to one or both sides. The lamination could optionally be done with adhesives or with a tie layer. When the non-woven layer is in contact with the polyurethane or polyisocyanurate insulating foam during the manufacturing process, the non-woven layer may increase the surface roughness and surface area of the woven mat to allow the woven mat to have better adhesion or bonding with the polyurethane or polyisocyanurate foam. When the non-woven layer is positioned on the outside (i.e.: top or bottom) of the foam insulation board, it may enhance the slip resistance and improve adhesion performance with bonding adhesives during the field installation. The non-woven fiber can optionally be made of different polymer composition, such as polyester, polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, glass, Kevlar, basalt, carbon fiber, etc.
Optionally, the woven mats may be laminated with a glass scrim, glass mat, carbon fibers scrim, or coated PET scrim. When laminated to the woven mat, these materials could potentially improve dimensional stability of the facer and the insulation board.
Optionally, the woven mats can be made of low shrinkage polymer yarns or tapes. The shrinkage rate of polymer tape can be assessed by the percentage of length change when the polymer tape is heated from room temperature to 100° C. Preferably, the polymer tape used in the woven mat has <10% in shrinkage rate. Most preferable, the polymer tape has <5% shrinkage rate.
Optionally, flame retardants can be added to polymer yarns or tapes to enhance the fire resistance of the woven facer.
In another aspect, the present invention comprises a rolled woven facer material having a sufficiently desirable strength in both its machine direction and its cross direction. This rolled woven material can then be used as a top and/or bottom facer to a polyurethane or polyisocyanurate foam insulation board. Preferably, this rolled woven facer material is quite thin and has low weight.
In preferred embodiments, the present woven polypropylene facer has a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction, and also has a tongue tear strength of over 15 lbf in both a machine direction and a cross direction.
Advantages of the present woven facer material include the fact that it provides added surface strength, load-spreading and durability as compared to existing GRF and CGF facers. Such added surface strength and load-spreading allows for foot traffic and kneeling on the insulation boards during roof installation. It also provides superior hail resistance and equivalent mold/moisture resistance to that of CGF. Specifically, the present roofing system comprising the present facer has been shown to meet the “Very Severe Hail” test rating announced by Factory Mutual as described in FM 4470 (Class 1—VSH).
The present woven facer is preferably a light but strong and heavy duty material. An advantage of the present woven facer material is that it has higher fastener pull through force, and thus provides excellent wind uplift resistance after the insulation board has been secured to the roof. In addition, the present woven facer system is also very durable and lengthens the effective lifespan of the foam roofing insulation board. In optional embodiments, the woven facers are made of a polymer, such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, polyester, polyamide, etc. However, it is to be understood that other woven materials including both natural and synthetic yarns or tapes, such as cotton, cellulose, rayon, silk, hemp, sisal, etc. can be used as well.
As such, the present woven facer system also offers the advantages of a higher flex modulus and a higher fastener-plate pull-through resistance as compared to traditional GRF and CGF facers.
In the case of a woven polypropylene material, the present facer can optionally be made from a plastic film that has been drawn into filaments or tapes, and then woven to create a fabric sheet or mat. In these preferred aspects, the woven mat optionally comprises a nonwoven layer on one side that will promote adhesion to the polyurethane or polyisocyanurate foam and polymer coating on the other side that will enhance water, moisture and bleed through resistance. The polymer coating can optionally provide improved compatibility and adhesion to bonding adhesives during field installation.
Another advantage of the present woven facer material is its low cost. In addition, the present woven facer materials can optionally be made from recycled plastics, providing environmental benefits.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional side elevation view of a foam insulation board with top and bottom woven facers.
FIG. 2 is a sectional side elevation view of a foam insulation board similar to FIG. 1 , but with a non-woven layer or coating above and below each of the top and bottom woven facers.
FIG. 3 is a sectional side elevation view of a foam insulation board similar to FIG. 2 , but with a tie layer securing the woven and non-woven layers together.
 DETAILED DESCRIPTION OF THE PRESENT SYSTEM
As stated above, in one embodiment as seen in FIG. 1 , the present system provides an insulation board assembly 10 that comprises: a foam insulation board 12 that may optionally be made of polyurethane or polyisocyanurate foam, or a phenolic material or an expanded polystyrene material (EPS)); a top woven facer 20A attached onto a top side of the foam insulation board, top facer 20A being made of woven material that may optionally include polypropylene; and a woven bottom facer 20B attached onto a bottom side of the foam insulation board, bottom facer 20B also optionally being made of woven polypropylene. In alternate aspects, other woven materials may be used instead, including both natural and synthetic fibers.
In another embodiment, the present system provides a thin, rolled woven facer material that has sufficient strength in both its machine and cross directions that can be attached onto the foam insulation board (for example, during an extrusion process with the foam being sandwiched between top and bottom woven facers).
Traditionally, polyurethane or polyisocyanurate is a closed-cell, rigid foam insulation board consisting of a foam core sandwiched between two facers. It is the most widely used insulating material for above-deck commercial roof construction in North America. In many existing systems, the facer materials are fiberglass, but even kraft paper has been used. These polyurethane or polyisocyanurate insulation boards are attached to the roof deck with various mechanical fasteners and construction adhesives or held in place with ballast stones or concrete pavers placed above the roofing membrane. Typically, the roofing membrane also may be mechanically attached through the foam insulation, adhered to the top polyurethane or polyisocyanurate facer or even held in place with ballast.
In accordance with the present system, the present inventors experimentally tested various facers (GRF, CGF, Non-woven polyester and woven polypropylene facer materials). The results of these experimental tests are shown in Table 1, below:
TABLE 1
Common physical properties of different facer materials.
Nonwoven Woven
GRF CGF PET PP
Tensile (MD) (lbf/3 in.) 46 69 107 132
Tensile (CD) (lbf/3 in.) 38 67 67 119
Breaking Elongation- 1.7 2 39 14
MD (%)
Breaking Elongation- 2 2 50 12
CD (%)
Tear MD (lbf) 0.4 0.6 6.8 47.0
Tear CD (lbf) 0.7 0.8 10.5 49.0
In addition, the present inventors also experimentally tested the same facer materials for “Pull-Through” and “wind uplift”. The results of these experimental tests are shown in Table 2 below.
The Pull-Through test procedure is designed to evaluate the strength of substrate/stress plate combinations by using tensile loading. The test method described below utilizes a nominal 14×14 in. test sample and test jig. The test method is intended to be used to evaluate various membranes, membrane/stress plate combinations, substrates or substrate/stress plate combinations for comparison to each other in order to determine the products are to be used large scale wind resistance classification testing.
The detailed testing procedure is as follows. The 14×14 Substrate Test Jig is secured to the moving crosshead of the Tinius Olsen machine. When ready for testing, the sample is slid into the 14×14 Substrate Test Jig with the stress plate located on the underside of the test sample. The screw end of the fastener is then secured in into the stationary jaw. Zero the Tinius Olsen machine to clear data before the first sample is tested. Force is exerted in a direct line perpendicular to the plane of the substrate/stress plate interface at a crosshead speed of 2 in./min (51 mm/min). While the sample is being tested, the sample shall be visually examined to ensure that it continues to meet the Conditions of Acceptance. Continue the testing until the sample fails, higher forces are unable to be attained or maintained, or at the discretion of the test sponsor. Failure is considered to occur when the Conditions of Acceptance are no longer being met or until the tensile force is no longer able to be maintained. Upon completion of the test, the sample shall be examined and any item not conforming to the Conditions of Acceptance noted. The results of the Pull-Through Test shall be stated in pounds. The result assigned to the sample shall be the maximum force which the sample reached prior to failure. Conditions of Acceptance are: 1. all samples should remain secured in their test jig until failure of the test sample; 2. the overall sample results shall be determined based on the average of three (3) tests. If the standard deviation of the three values divided by the mean is greater than 20%, an additional test(s) shall be conducted. The results of all tests shall be used to determine the final average.
TABLE 2
Performance of polyisocyanurate board
with different facer materials.
Nonwoven Woven
Facer Type GRF CGF PET PP
Pull-through (lbf) 177 262 263 455
Wind uplift 1-60 1-90 1-105 1-120
While the woven facer performed exceedingly well when compared to GRF and CGF with fastener pull-through/wind uplift, it also shows superior performance with regard to moisture resistance per ASTM C209-Water Absorption. This is shown below in Table 3.
TABLE 3
Moisture absorption of polyisocyanurate
board with different facer materials.
Nonwoven Woven
Facer Type GRF CGF PET PP
Water Absorption 0.39% 0.30% 0.07% 0.06%
As a result of this testing, it was discovered that woven polypropylene facers 20A and 20B offered substantial benefits (as described herein) over traditional GRF and CGF facers.
In particular, the present woven facers 20A and 20B provide the advantages of strength in both (perpendicular) machine direction and cross directions. In preferred aspects, the strength in the cross direction is at least 70% of the strength in the machine direction.
In the case of woven facer materials supplied on rolls, the present facer materials preferably have weight of 20 gsm to 200 gsm; and a tensile strength of at least 80 lb. The advantage of this small thickness is that it makes the facers easier to roll.
In various optional aspects, the woven facers 20A and 20B can be made of natural and/or synthetic yarns and/or tapes. The synthetic yarns or tapes can be made from polymers such as polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, polyester, acrylic polyester, polyamide, aramid etc. The yarns can be made from natural fibers, such as cotton, cellulose, wool, rayon, silk, hemp, sisal, etc.
In preferred embodiments, the present insulation board assembly meets the Very Severe Hail (VSH) rating of FM 4470 (Class 1). This can even be accomplished using low or typical density insulation board. In one embodiment, the foam insulation board has a density of 0.5 to 6.0 pcf. This represent an advantage over existing (and costlier) approaches of using gypsum or press board to achieve the Very Severe Hail (VSH) rating.
In addition, the adhesion between the insulation board and the facer could potentially be stronger than can be achieved by existing standard density insulation boards and facers made of paper, glass fiber reinforced paper or coated glass facers (GRF/CGF), foils, films or laminates.
In optional preferred embodiments, the present insulation board with woven facer may also be used under a sheet of roof membrane, such as EPDM (Ethylene Propylene Diene Monomer), TPO (thermoplastic olefin), PVC (polyvinyl chloride), KEE (ketone ethylene ester) or Hypalon, of various thickness to provide a roofing structure capable of achieving the Very Severe Hail (VSH) rating. Optionally, EPDM, TPO, PVC, KEE and Hypalon roof membrane can have non-woven materials laminated on the back side. The non-woven fleece could potentially improve the adhesion performance of roof membrane to the insulation board.
In other optional preferred aspects, bonding adhesives are used to adhere the roof membrane onto the insulation board. Optionally, such bonding adhesive can include extruded coatings, spray coatings or roller applied coatings. Examples of such adhesive promoters include Flexible FAST™, TPO bonding adhesive, Cav-Grip III™ and EPDM bonding adhesive.
Roof System Performance:
Factory Mutual's 4470's procedure for Very Severe Hail (VSH) Testing is a new test standard that has had a significant impact on the construction of commercial roof systems in fourteen states throughout the Midwest. The test involved propelling a 2-inch-diamter ice ball at a roof system test specimen at a velocity of 152 to 160 feet per second. The membrane must not be punctured and it must remain adhered to the substrate board. The substrate boards cannot be cracked or have the facers delaminated from the foam to pass this test.
Two widely used cover boards (i.e.: High Density (HD) Polyiso and Gypsum board), that are used in the commercial roofing industry have been unable to withstand this VSH test (See Table 4 and 5 below). The only roofing systems that have been able to achieve limited success on the VSH rating so far have incorporated OSB cover boards and Plywood cover boards (See Table 6 below). However, the OSB and Plywood boards have significant limitation since they are expensive, heavier than 0.5″ HD Polyiso, and are not able to achieve the same fire ratings that systems containing Gypsum or HD Polyiso cover boards.
TABLE 4
VSH test results for ½″ SecurShield HD Polyiso board.
Test-
ing Reason
Lo- VSH for
Insulation Membrane Adhesive cation Results failure
½″ 145 EPDM Flex FAST FM Fail Cracks
SecurShield Fleece in HD
High 115 EPDM Flex FAST FM Fail Board
Density Fleece
Polyiso 90 mil EPDM EPDM FM Fail
Board Bonding
75 mil Sure- EPDM FM Fail
Tough Bonding
145 White Flex FAST FM Fail
EPDM Fleece
115 White Flex FAST FM Fail
EPDM Fleece
90 mil White EPDM FM Fail
EPDM Bonding
135 PVC Fleece Flex FAST FM Fail
115 PVC Fleece Flex FAST FM Fail
80 mil PVC PVC Bonding FM Fail
135 TPO Fleece Flex FAST FM Fail
115 TPO Fleece Flex FAST FM Fail
80 mil TPO TPO Bonding FM Fail
TABLE 5
VSH test results for ½″ DensDeck Prime board (Gypsum).
Testing Reason
Lo- VSH for
Insulation Membrane Adhesive cation Results failure
½″ 145 EPDM Flex FAST FM Fail Loss of
DensDeck Fleece Ad-
Prime 115 EPDM Flex FAST FM Fail hesion
Board Fleece (gypsum
90 mil EPDM EPDM FM Fail turned to
Bonding powder
75 mil Sure- EPDM FM Fail at area
Tough Bonding of
145 White Flex FAST FM Fail impact)
EPDM Fleece
115 White Flex FAST FM Fail
EPDM Fleece
90 mil White EPDM FM Fail
EPDM Bonding
135 PVC Fleece Flex FAST FM Fail
115 PVC Fleece Flex FAST FM Fail
80 mil PVC PVC Bonding FM Fail
135 TPO Fleece Flex FAST FM Fail
115 TPO Fleece Flex FAST FM Fail
80 mil TPO TPO Bonding FM Fail
TABLE 6
VSH test results for StormBase (OSB) board.
Reason
Testing VSH for
Insulation Membrane Adhesive Location Results failure
StormBase 145 EPDM Flex FAST FM Fail cracks
(OSB) Fleece in
115 EPDM Flex FAST FM Fail OSB
Fleece
90 mil EPDM EPDM FM Fail
Bonding
90 mil White EPDM FM Fail
EPDM Bonding
75 mil Sure- EPDM FM Fail
Tough Bonding
115 White Flex FAST FM Fail
EPDM Fleece
145 White Flex FAST FM Pass
EPDM Fleece
135 PVC Fleece Flex FAST FM Fail heat
115 PVC Fleece Flex FAST FM Fail aging
80 mil PVC PVC Bonding FM Fail fail
135 TPO Fleece Flex FAST FM Pass
115 TPO Fleece Flex FAST FM Pass
80 mil TPO TPO Bonding FM Pass
In contrast to the above existing systems, various embodiments of the present invention (i.e.: systems containing high density and normal density Polyiso insulation boards made with woven polypropylene facer materials) showed significant improvement and were able to withstand the VSH Test. The present roof systems successfully passed both internal and Factory Mutual tests due to the unique physical properties provided by the present woven facers. The results are summarized in the Table 7 and 8 below.
As can be appreciated, the present roof systems using standard density or high density insulation board and woven PP facers can be paired with TPO FleeceBACK, EPDM FleeceBACK, PVC FleeceBACK, KEE FleeceBACK and bareback TPO, EPDM, PVC and KEE HP. These membranes may optionally be bonded with two-part polyurethane adhesive, TPO Bonding adhesives, PVC adhesives, EPDM Bonding Adhesives, water based adhesives, LVOC bonding adhesives and Cav-Grip III. This type of roof system has significant performance advantageous over that with OSB and plywood board as the insulation board with woven PP facer delivers higher R-value per inch and is less costly.
TABLE 7
VSH test results for ½″ HD Polyiso board with woven PP facer.
Testing VSH
Insulation Source Membrane Adhesive Location Results
½″ HD This 45 mil TPO Cav-Grip III in-house pass
Polyiso invention 60 mil TPO Cav-Grip III in-house pass
w/Woven 90 mil White 90-8-30A in-house pass
PP Facer EPDM
105 EPDM Flex FAST in-house pass
Fleece
60 mil TPO Cav-Grip III FM pass
80 mil TPO Cav-Grip III FM pass
TABLE 8
VSH test results for normal density
Polyiso board with woven PP facer.
Testing VSH
Insulation Source Membrane Adhesive Location Results
Standard This 80 mil TPO Cav-Grip III in-house pass
Density in- 90 mil White 90-8-30A in-house pass
Polyiso vention EPDM
w/Woven 105 EPDM Flex FAST in-house pass
PP Facer Fleece
60 mil TPO Cav-Grip III FM pass
80 mil TPO Cav-Grip III FM pass
In preferred aspects illustrated in FIG. 2 , the woven facers preferably include chemical coatings to make them waterproof. Specifically, system 10 comprises a foam insulation board 12, having a top woven facer 20A and a bottom woven facer 20B, as described above. Preferably, top woven facer 20A and bottom woven facer 20B comprise no glass fibers. Foam insulation board preferably has a density of 0.5 to 6.0 pcf and the fastener Pull-Through value is higher than 300 lbf. Preferably, the roof assembly 10 consists of roof membrane, bonding adhesive and the insulation board, and wherein the roof assembly meets the Very Severe Hail rating of FM 4470 (Class 1).
Preferably, each of woven facers 20A and 20B comprise yarns or tapes made from synthetic polymers such as woven polypropylene and/or propylene alpha-olefin copolymers or ethylene alpha-olefin copolymers having a warp density from 4 to 30 EPI or a weft density from 4 to 30 PPI, a weight from 40 to 200 grams per square meter, and a thickness of 2 mil to 50 mil. Preferably, each of the top and bottom facers 20A and 20B have a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction and a tear strength of over 15 lbf in both a machine direction and a cross direction.
As seen in FIG. 2 , each of facers 20A and 20B may optionally have a polymer coating on one or both side of one or both of the top and bottom facers (i.e.: 22A, 24A, 22B and 24B). In preferred aspects, some or all of polymer coating layers 22A, 24A, 22B and 24B are selected from the group consisting of: polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, silicones, acrylates, polyurethane, natural rubber, and styrene butadiene rubber.
Alternatively, each of facers 20A and 20B may optionally have a non-woven material laminated on one or both side of one or both of the top and bottom facers (i.e.: layers 22A, 24A, 22B and 24B). The non-woven material layers may be selected from the group consisting of polyester, polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, glass, Kevlar, basalt, and carbon fiber. As such, layers 22A, 24A, 22B and 24B can comprise various polymer coatings or other non-woven material. Optionally, layers 24A and 24B can comprise a laminated glass mat, a glass scrim or a coated glass scrim.
Finally, as seen in FIG. 3 , the non-woven layers 24A and 24B can be laminated to the woven layers 20A and 20B via an adhesive or a tie layer 26A, 26B.
In alternate aspects, the present system comprises a rolled insulation facer formed from a woven material having a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction, and a tear strength of over 15 lbf in both the machine direction and the cross direction. In this aspect, the woven material comprises yarns or tapes made from synthetic polymers, including but not limited to polypropylene and/or propylene alpha-olefin copolymers and/or ethylene alpha-olefin copolymers. Preferably, the woven material is waterproof

Claims (17)

What is claimed is:
1. A method of forming an insulation board assembly, comprising:
(a) providing a first roll of facer material, the first roll of facer material being woven and having a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction and a weight of 20 to 200gsm;
(b) providing a second roll of facer material, the second roll of facer material being woven and having a tensile strength greater than 80 lbf/3 inch in both a machine direction and a cross direction and a weight of 20 to 200gsm;
(c) applying foam between the first and second rolls of facer material to form an insulation board assembly that when adhered or mechanically fastened onto a roof assembly permits the roof assembly to meet the Very Severe Hail rating of FM 4470 (Class 1); and
(d) adhering or mechanically fastening the insulation board assembly onto a roof assembly such that the roof assembly meets the Very Severe Hail rating of FM 4470 (Class 1).
2. The method of claim 1, wherein a bottom surface of the first roll of facer material is in direct contact with the foam, and wherein a top surface of the second roll of facer material is in direct contact with the foam during the application.
3. The method of claim 1, wherein the first and second rolls of facer material each have a warp density from 4 to 30 ends per inch or a weft density from 4 to 30 picks per inch.
4. The method of claim 1, wherein the first and second rolls of facer material each have a tear strength of over 15 lbf in both the machine direction and the cross direction.
5. The method of claim 1, wherein the first and second rolls of facer material each comprise woven polypropylene and/or propylene alpha-olefin copolymers or ethylene alpha-olefin copolymers.
6. The method of claim 1, wherein the first and second rolls of facer material comprise no glass fibers.
7. The method of claim 1, wherein the first and second rolls of facer material comprise yarns or tapes.
8. The method of claim 1, wherein the first and second rolls of facer material each have a thickness of 2 mil to 50 mil.
9. The method of claim 1, wherein the foam is a polyisocyanurate or polyurethane foam.
10. The method of claim 1, wherein the foam of the insulation board assembly has a density of 0.5 to 6.0 pcf.
11. The method of claim 1, wherein the roof assembly consists of roof membrane, bonding adhesive and the insulation board assembly.
12. The method of claim 1, wherein the first and second rolls of woven facer material comprises yarns or tapes made from synthetic polymers.
13. The method of claim 1, further comprising: applying a polymer coating on one or both side of one or both of the first and second rolls of facer material.
14. The method of claim 1, further comprising: applying a non-woven material laminated on one or both side of one or both of the facers first and second rolls of facer material.
15. The method of claim 14, wherein the non-woven material is laminated via adhesive or a tie layer.
16. The method of claim 14, wherein the non-woven material is selected from the group consisting of polyester, polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers, nylon, glass, Kevlar, basalt, and carbon fiber.
17. The method of claim 1, further comprising: applying a laminated glass mat, a glass scrim or a coated glass scrim on one or both side of one or both of the first and second rolls of facer material.
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